It all has to do with the miners that they are operating in their part of the world.
The mine so much that they hold most of the mined bitcoins being available.
The price most definitely is driven by that factor of the bitcoin ecosystem.
I believe as well that bitcoin price is driven by the bitcoin ecosystem.
Chine is the country with the highest number of people.
I think that when the number of bitcoin users in China grows, their influence on the bitcoin ecosystem grows as well.
In the future Asia, especially China will have a much bigger influence on bitcoin than it has today. Not because of the miners, but because of the people who use bitcoin.